Question

1. Write the electronic configuration of the following: 
   1. d⁴ (high spin octahedral)
   2. d⁶ (low spin octahedral)
2. Based on the above configuration, calculate the value of Crystal Field Splitting Energy (CFSE). (Ignore pairing energy)

Answer 1

(a) (1) The electronic configuration of a d⁴ high-spin octahedral complex is `t_(2g)^3 e_g^1`.

(2) The electronic configuration of a d⁶ low-spin octahedral complex is `t_(2g)^6 e_g^0`.

(b) (1) CFSE = (3 × −0.4 Δ_o) + (1 × 0.6 Δ_o)

= −1.2 Δ_o + 0.6 Δ_o

= −0.6 Δ_o

(2) CFSE = (6 × −0.4 Δ_o) + (0 × 0.6 Δ_o)

= −2.4 Δ_o + 0 Δ_o

= −2.4 Δ_o